TM 9-4120-407-14
Table 3-3. Unit Troubleshooting Table - Cont
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. COMPRESSOR STARTS NORMALLY, BUT HIGH PRESSURE CUTOUT SWITCH SOON TRIPS. -
Cont
Step 4. Check to be sure the lower front panel (5) is not loose or missing.
Secure the lower front panel.
Step 5. Check to be sure condenser fan motor is operating when compressor starts (air should be coming
out the condenser air outlet).
Test, and if necessary replace, the condenser fan motor per paragraph 3-37.
4. COOLING CAPACITY REDUCED.
Step 2. Check that all doors, windows, and other openings in room or enclosure are tightly closed.
Tightly close all openings.
Step 2. Check that fresh air damper is not open.
Fully close fresh air damper by turning the control knob (1) to CLOSE. When condition
improves, adjust as necessary.
Step 3. Check adjustment of the potentiometer TEMPERATURE control (2).
Adjust the potentiometer TEMPERATURE control fully toward the COOL position. When
condition improves, adjust as necessary.
Step 4. Check that
the evaporator air discharge (3) and return
(4) grille louvers
are fully open.
Fully open louvers.
Step 5.
Check that
the condenser air intake (5) and discharge (6) are not obstructed.
Remove obstruction.
3-53